It's very unfortunate that the term "Arduino" is used both for a specific company name and also for generic module compatibility from any manufacturer.
My Mega2560 is marked "WWW.ARGUINO.CC" and "DESIGN IN ITALY".
My "Arduino Sensor Shield v5.0" has "SainSmart" stenciled on the reverse side, yet Arduino.cc sells an apparently identical shield with an identically-colored PCB. The shield is actually labeled "Ar dulno Sensor Shieldv5.0" [sic], misspellings and all. SainSmart says they are a "team" that is "bringing you the cool items from Pearl River Delta of China, the global manufacture powerhouse". WTH is "Pearl River Delta of China", anyway ??? (This is a rhetorical question since SainSmart won't provide an answer.)